Improve SEO for newer versions of API documentation

Currently when searching for API docs for various client libraries (for example, C), search terms which include the names of functions (or even directly searching for 'libcouchbase') will yield either no relevant results, or even worse, provide the user with older versions of the library (and I mean things that have not been updated for over a year).

This has been a chronic issue facing users – see for example, CCBC-576.

As someone who uses google as the main search entry point when developing, we don't really make ourselves google friendly in trying to find usage examples and reference documentation.